The World of Metals and Non-metals — Science STD 7 — Question

Rusting can cause significant damage to iron structures, but fortunately, there are several ways to prevent it. Here are three common methods:
1. Painting:
Painting iron surfaces is one of the simplest and most widely used methods. The paint creates a barrier that prevents air and moisture from coming into contact with the iron.
2. Oiling and Greasing:
Applying a layer of oil or grease on iron surfaces also helps prevent rusting. Like paint, oil and grease create a protective layer that keeps moisture and air away from the metal.
3. Galvanization:
Galvanization involves coating iron with a thin layer of zinc. Zinc is more reactive than iron, so it corrodes first, protecting the iron underneath. Even if the zinc coating is scratched, it continues to protect the iron.